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• avcodec/cfhd : Keep track of which subbands have been read

  3 avril 2021, par Michael Niedermayer

  avcodec/cfhd : Keep track of which subbands have been read
  This avoids use of uninitialized data
  
  also several checks are inside the band reading code
  
  so it is important that it is run at least once
  Fixes : out of array accesses
  
  Fixes : 28209/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CFHD_fuzzer-5684714694377472
  
  Fixes : 32124/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CFHD_fuzzer-5425980681355264
  
  Fixes : 30519/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CFHD_fuzzer-4558757155700736
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/cfhd.c
  • [DH] libavcodec/cfhd.h

• mp4 file upload issue in multer of node.js

  20 mars 2021, par 이훈석

  I'm trying to upload mp4 file by using multer in node.js

  


  (View)VideoUploadPage.js

  


  import React, { useState } from "react";
import Axios from "axios";


function VideoUploadPage() {

const onDrop = (files) => {
    let formData = new FormData();
    const config = {
      header: { "content-type": "multipart/form-data" },
    };
    formData.append("file", files[0]);
    console.log(files);

    Axios.post("/api/video/uploadfiles", formData, config).then((response) => {
      if (response.data.success) {
        console.log(response.data);
      } else {
        alert("비디오 업로드를 실패 했습니다.");
      }
    });
  };

}


  


  (Server)

  


  video.js

  


  const express = require("express");
const router = express.Router();
const multer = require("multer");
const path = require("path");
const ffmpeg = require("fluent-ffmpeg");



let storage = multer.diskStorage({
  destination: (req, file, cb) => {
    cb(null, "uploads/");
  },
  filename: (req, file, cb) => {
    cb(null, `${Date.now()}_${file.originalname}`);
  },
  fileFilter: (req, file, cb) => {
    const ext = path.extname(file.originalname);
    if (ext !== ".mp4") {
      return cb(res.status(400).end("only mp4 is allowed"), false);
    }
    cb(null, true);
  },
});

const upload = multer({ storage: storage }).single("file");

router.post("/uploadfiles", (req, res) => {
  upload(req, res, (err) => {
    if (err) {
      return res.json({ success: false, err });
    }
    return res.json({
      success: true,
      url: res.req.file.path,
      fileName: res.req.file.filename,
    });
  });
});


  


  At the video.js destination : (req, file, cb) => &#xA;cb(null, "uploads/")&#xA; <----- I can check which file is going to upload with console.log(response.data), but there is no mp4 file in the "uploads" folder.

  &#xA;

  When I changed "uploads/" to my local directory path, mp4 file is on the uploads folder ....

  &#xA;

  ex : "C :// /uploads"

  &#xA;

  Any idea ?

  &#xA;

• How to use delogo with ffmpeg when logo starts at y=0

  22 avril 2021, par Valentin

  I have a 1920x800 video, all content, no black bars. At the top of the frame (y=0) there is a station logo I want to remove (presumably the original capture was cropped, leaving a half of a station logo inside the usable frame). Since the logo I'm trying to remove starts at the very top of the frame and because the default band=1 option that cannot be changed anymore (the option was seemingly removed from the API), the command needs to take it into account and make y=1 :

  &#xA;

  ffmpeg -i video.mp4 -vf "delogo=x=1696:y=1:w=113:h=32:show=1" output.mp4


  &#xA;

  but this breaks the interpolation, since that 1px on top is completely dirtying the box :&#xA;Logo with show=1 so we see the problem

  &#xA;

  Tries with y=0 fail with or without trying to specify the band width (with band=0 or the alias t=0) :

  &#xA;

  ffmpeg -i video.mp4 -vf "delogo=x=1696:y=0:w=113:h=33:band=0" output.mp4
[Parsed_delogo_0 @ 0000020528a7cf00] Option 'band' not found
ffmpeg -i video.mp4 -vf "delogo=x=1696:y=0:w=113:h=33:t=0" output.mp4
[Parsed_delogo_0 @ 000002b9b87acf40] Option 't' not found
ffmpeg -i video.mp4 -vf "delogo=x=1696:y=0:w=113:h=33" output.mp4
[delogo @ 0000023d971cd000] Logo area is outside of the frame.


  &#xA;

  Is there a solution to this ?

  &#xA;